Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

FEM-Investigations Of Superconductor/Ferromagnet Heterostructures: A Compliance Test Between Various Models

P. Krüger[1], F. Grilli[1], Y. Genenko[2], and R. Brambilla[2]
[1]Karlsruhe Institute of Technology, Germany
[2]Technical University Darmstadt, Germany, ERSE Spa, Milan, Italy

In recent years, a number of numerical and finite-element-methods in particular - some implemented in COMSOL - have been developed to investigate various properties of superconducting materials. Following converse conclusions by different models regarding similar physical phenomena, the consistency of these models has been of increased interest. In this publication the accordance of an ...

High Field Magnetic Diffusion into Nonlinear Ferrimagnetic Materials

J-W. Braxton Bragg[1], J. Dickens[1], A. Neuber[1], and K. Long[2]
[1]Center for Pulsed Power and Power Electronics, Texas Tech University, Lubbock, TX
[2]Dept. of Mathematics, Texas Tech University, Lubbock, TX

Ferrimagnetic based, coaxial nonlinear transmission lines (NLTLs) provide a means to generate sub-nanosecond risetime pulses (from nano-second input pulses) or megawatt level high power microwave oscillations, depending on the geometry, material, and external bias fields. This investigation uses the commercially available, finite element solver COMSOL to provide insight into pulse behavior. ...

An Automatic Modeling Approach for Optimized Positioning of an Electrostimulative Implant in the Human Femoral Head - new

Y. Su[1], D. Kluess[1], W. Mittelmeier[1], M. Ellenrieder[1], U. van Rienen[2], R. Bader[1]
[1]Department of Orthopaedics, University of Rostock, Rostock, Germany
[2]Institute of General Electrical Engineering, University of Rostock, Rostock, Germany

Introduction Electromagnetic stimulation is a common therapy to support bone healing in cases of avascular necrosis or pseudarthrosis. An electrostimulative screw implant (Asnis III s-series screw in Figure 1) is used to stimulate bone regeneration in the treatment of femoral head avascular necrosis. To enable positive outcome of the treatment, optimal positioning of the electric implant is ...

AC/DC Modeling and Experimental Impedance Verification of 3D MEMS Inductor Coils

T. Reissman, and E. Garcia
Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY, USA

In this work, an analysis is presented for a 3-dimensional RF MEMS coil using the COMSOL AC/DC module in conjunction with the CAD import module. The realization of being able to produce such 3-dimensional RF coils allows for less surface area to be needed for similar inductor performance in comparison to larger planar RF coils by maintaining the same number of turns through super-positioning of ...

Thermal Analysis of Packaged Deep Ultraviolet LEDs

A. Dobrinsky[1], M. Shatalov[1], M. Shur[1], R. Gaska[1]
[1]Sensor Electronic Technology, Columbia, SC, USA

Deep Ultraviolet Light Emitting Diodes (DUV LEDs) are presently operating at a relatively low efficiency, thus large amount of LED driving power is dissipating in heat. Thermal heating degrades LED performance and decreases LED’s lifetime. The degradation of DUV LED devices with temperature increase makes thermal management a key issue for DUV LEDs. We present a thermal analysis of DUV LED ...

Quasi-TEM Analysis of Multiconductor Transmission Lines Embedded in Layered Dielectric Region

S.M. Musa[1], and M.N.O. Sadiku[1]
[1]Prairie View A&M University Networking Academy, Prairie View, Texas, USA

This paper presents the quasi-TEM two-dimensional (2D) approach for the analysis of multiconductor transmission lines interconnect in single and two-layered dielectric region using the finite element method (FEM). FEM is especially suitable and effective for the computation of electromagnetic fields in strongly inhomogeneous media. We illustrate that FEM is as suitable and effective as other ...

Time Domain Analysis of Eddy Currents in Saturating Magnetic Materials

S. Thompson
Applied Research Laboratory
Penn State University
State College, PA

Eddy current phenomena in conducting magnetic media are well understood, although the detailed behavior at high drive levels leading to magnetic saturation are not always well explained. This paper considers the example of an infinite cylindrical magnetic core with an external coil. At high frequencies the interaction of the induced flux and current in the core confine them both to a thin ...

Dynamic Study of Field and Current Distribution in Multifilamentary YBCO Thin Films

F. Grilli[1], A. Lucarelli[2], G. Lüpke[2], T. Haugan[3], and P. Barnes[3]

[1]Ecole Polytechnique de Montréal, Montréal, QC, Canada
[2]College of William and Mary, Williamsburg, VA, USA
[3]Air Force Research Laboratory

We have developed a model for computing current and field distributions in multifilamentary superconducting thin films subjected to the simultaneous effects of transport ac current and applied dc field perpendicular to the sample. The model is implemented in COMSOL’s PDE module (general form) and solves Maxwell equations using a highly non-linear resistivity to describe the superconductor ...

Modelling of Selected Electromechanical Phenomena in the DC Machine

M. Antczak, P. Idziak, and W. Lyskawiski
Poznań University of Technology, Poland

The paper presents the results of the experiment consisting in determination of the influence of the magnetic field on deformations of the stator and the rotor of the DC motor. The numerical model of the motor for the frameless DC machine of the G series has been elaborated. Real material properties and the phenomenon of the magnetic circuit saturation have been taken into consideration. The ...

Modeling of Nonlinear and Non-stationary Multi-vortex Behavior of Electronic Crystal in Restricted Gemoetries of Nano Junctions

T. Yi, Y. Luo, and S. Brazovskii
Université Paris-sud
Orsay, France

Electronic Crystals are common forms of organization of charge in solids. They appear widely from nano-structure semiconductors to synthetic organic conductors. Charge density wave, the best treated kind of electronic crystal, can readjust its elementary units by creation of topological defect or vortex. Experimental accesses to these phenomena came from nano-junctions, scanning tunneling ...